This rare, pink diamond will be auctioned by Sothebys next...

This rare, pink diamond will be auctioned by Sothebys next month. It is expected to bring $38 million. (Undated) Credit: Getty Imates

GENEVA - Sotheby's says it will auction a rare pink diamond next month that could fetch up to $38 million.

The auction house says the "fancy intense pink" gem is being sold by an unnamed private collector and was last on the market 60 years ago.

Sotheby's says the 24.78 carat diamond has a classic emerald cut with gently rounded corners.

The company says the stone has a flaw unnoticeable to the naked eye but may be graded internally flawless after repolishing.

Sotheby's estimated Monday that the diamond will sell for $27-38 million.

The diamond went on exhibition worldwide starting in Hong Kong

on Oct. 2 before going up for auction Nov. 16 in Geneva.

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